{"id":3366,"date":"2026-09-07T15:02:55","date_gmt":"2026-09-07T15:02:55","guid":{"rendered":"https:\/\/ultrasuonindt.it\/en-1090-and-structural-connections\/"},"modified":"2026-10-01T18:38:17","modified_gmt":"2026-10-01T18:38:17","slug":"en-1090-and-structural-connections","status":"publish","type":"page","link":"https:\/\/ultrasuonindt.it\/en\/ndt-technologies-and-standards\/standards-for-bolted-joint-tightening\/en-1090-and-structural-connections\/","title":{"rendered":"EN 1090 and structural connections"},"content":{"rendered":"\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:36%\">\n<figure class=\"wp-block-image size-large has-custom-border\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"1200\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?resize=1200%2C1200&#038;ssl=1\" alt=\"Measurement on structural steelwork parts\" class=\"wp-image-1014\" style=\"border-color:#000000;border-width:1px;border-radius:15px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?resize=768%2C768&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:4%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<div class=\"wp-block-group has-background is-layout-flow wp-block-group-is-layout-flow\" style=\"border-top-right-radius:6px;border-bottom-right-radius:6px;border-left-color:#225f78;border-left-width:6px;background-color:#ebf1f4;padding-top:24px;padding-right:28px;padding-bottom:24px;padding-left:28px\">\n<p class=\"has-text-color wp-block-paragraph\" style=\"color:#225f78;font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.408), 18px);font-style:italic;font-weight:400;line-height:1.6\">In steel structures the preloading of bolts is not an assembly detail: it is an execution requirement, and the standard states by which methods it can be achieved.<\/p>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\" style=\"padding-left:0px;line-height:1.6\">\n<li><strong style=\"color:#225f78\">\u2713<\/strong> EN 1090-2:2018 (+A1:2024), technical requirements for steel structures<\/li>\n\n\n\n<li><strong style=\"color:#225f78\">\u2713<\/strong> Section 8 deals with bolted connections<\/li>\n\n\n\n<li><strong style=\"color:#225f78\">\u2713<\/strong> Four preloading methods confirmed by the sources consulted<\/li>\n\n\n\n<li><strong style=\"color:#225f78\">\u2713<\/strong> No elongation-based method cited by the sources we checked<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n<p class=\"wp-block-paragraph\">EN 1090-2 is the execution standard for steel structures. The full title of part 2 is <em>\u201cExecution of steel structures and aluminium structures \u2014 Part 2: Technical requirements for steel structures\u201d<\/em>, that is \u00abExecution of steel structures and aluminium structures \u2014 Part 2: Technical requirements for steel structures\u00bb. The reference edition is that of 2018, supplemented by amendment A1 of 2024.  <\/p>\n\n<p class=\"wp-block-paragraph\">If your interest concerns bolted connections, the section to read is section 8, devoted to bolted connections. It is there that the standard addresses the subject of preload: the tensile load to be introduced into the shank of the bolt at tightening, which determines the behaviour of the connection under service load, particularly for slip-resistant shear connections. <\/p>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-4066 popmake-739\" style=\"border-width:1px;min-height:250px;aspect-ratio:unset;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"250\" class=\"wp-block-cover__image-background wp-image-727 size-full\" alt=\"\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1200%2C250&#038;ssl=1\" data-object-fit=\"cover\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=300%2C63&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1024%2C213&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=768%2C160&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-30 has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-15701bb7 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color is-style-default has-luminous-vivid-amber-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.374), 35px);\"><strong>Need help choosing the right product?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button popmake-4066 popmake-739\"><a class=\"wp-block-button__link has-ti-accent-color has-cyan-bluish-gray-background-color has-text-color has-background has-link-color wp-element-button\">Contact us<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">The operational distinction that matters is between bolts that are simply tightened and preloaded bolts. In the second case the value of the preload is a design datum, and the erector must be able to demonstrate that it has been reached: hence the need for defined and verifiable methods, which the standard lists. <\/p>\n\n<h2 class=\"wp-block-heading\">The four preloading methods<\/h2>\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Method<\/th><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Principle<\/th><\/tr><\/thead><tbody><tr><td>Torque method<\/td><td>The preload is obtained by applying a defined tightening torque<\/td><\/tr><tr><td>Combined method<\/td><td>Initial torque followed by a controlled further rotation<\/td><\/tr><tr><td>HRC method<\/td><td>Use of tension control bolts with spline ends that shear off<\/td><\/tr><tr><td>Direct tension indicator (DTI) method<\/td><td>Indicating washers that show when the preload has been reached<\/td><\/tr><tr><td>Normative reference<\/td><td>EN 1090-2:2018 (+A1:2024), section 8, bolted connections<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">What the sources consulted say and do not say<\/h2>\n\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:36%\">\n<figure class=\"wp-block-image size-large has-custom-border\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_bt_bolt_tension_monitor_per-applicazioni_di_misura_elongazione_bulloni-web-700x700-1.webp?resize=700%2C700&#038;ssl=1\" alt=\"Instrument for measuring bolt elongation\" class=\"wp-image-997\" style=\"border-color:#000000;border-width:1px;border-radius:15px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_bt_bolt_tension_monitor_per-applicazioni_di_misura_elongazione_bulloni-web-700x700-1.webp?w=700&amp;ssl=1 700w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_bt_bolt_tension_monitor_per-applicazioni_di_misura_elongazione_bulloni-web-700x700-1.webp?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_bt_bolt_tension_monitor_per-applicazioni_di_misura_elongazione_bulloni-web-700x700-1.webp?resize=150%2C150&amp;ssl=1 150w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:4%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<p class=\"wp-block-paragraph\">The sources we checked \u2014 the official contents list of the standard and sector technical documentation \u2014 confirm the four preloading methods listed above: torque, combined, HRC and direct tension indicator.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We prefer to tell you just as plainly what those same sources do <strong>not<\/strong> report: neither of them cites preloading methods based on measuring the elongation of the bolt, nor ultrasonic methods. We therefore do not claim that EN 1090-2 provides for them. Anyone who has to assess the use of such a technique on a structure subject to the standard must verify its admissibility against the text in force and agree it in the execution documentation.  <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ultrasonic measurement of elongation remains in any case an independent testing technique, widely used in other industrial contexts where it is necessary to know the load actually present in a bolt rather than the torque applied.<\/p>\n<\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\">Recommended instruments<\/h2>\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Instrument<\/th><th style=\"background-color:#225f78;color:#ffffff;padding:10px\">Use<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/bolt-tension-monitors\/dakota-bt1-dl-portable-bolt-tension-monitor\/\">Dakota BT1-DL<\/a><\/td><td>Portable bolt tension monitor, for use on site<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/bolt-tension-monitors\/dakota-bt2-dl-benchtop-bolt-tension-monitor\/\">Dakota BT2-DL<\/a><\/td><td>Benchtop version for testing and characterisation in the workshop<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/bolt-tension-monitors\/dakota-multimax-remote-bolt-tension-monitoring-4-channels\/\">Dakota MultiMax<\/a><\/td><td>Remote monitoring on four channels<\/td><\/tr><tr><td><a href=\"https:\/\/ultrasuonindt.it\/en\/products\/software-and-apps\/multiui-interface-for-the-dakota-multimax\/\">MultiUI<\/a><\/td><td>Configuration and monitoring of the MultiMax system<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1757402201\"><strong class=\"schema-faq-question\">Which part of EN 1090 concerns steel structures?<\/strong><p class=\"schema-faq-answer\">Part 2, titled Execution of steel structures and aluminium structures \u2014 Part 2: Technical requirements for steel structures. The reference edition is that of 2018, supplemented by amendment A1 of 2024. <\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-1757402202\"><strong class=\"schema-faq-question\">What are the preloading methods provided for?<\/strong><p class=\"schema-faq-answer\">The sources consulted confirm four methods: the torque method, the combined method, the HRC method and the direct tension indicator (DTI) method. The subject is dealt with in section 8 of the standard. <\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-1757402203\"><strong class=\"schema-faq-question\">Does EN 1090-2 admit ultrasonic measurement of elongation?<\/strong><p class=\"schema-faq-answer\">The sources we consulted do not cite elongation-based or ultrasonic preloading methods, and we prefer to say so openly rather than to assume it. Any such use must be verified against the text of the standard in force and agreed in the execution documentation. <\/p><\/div><\/div>\n\n<p class=\"wp-block-paragraph\">Back to <a href=\"https:\/\/ultrasuonindt.it\/en\/ndt-technologies-and-standards\/standards-for-bolted-joint-tightening\/\">Standards for bolted tightening<\/a> or write to us from the <a href=\"https:\/\/ultrasuonindt.it\/en\/contact\/\">Contact<\/a> page.<\/p>\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h5 class=\"wp-block-heading\">Further information and contacts <\/h5>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\"><a href=\"http:\/\/www.roder.it\">Systems division and sensor integration partner : www.roder.it<\/a><br\/><a href=\"https:\/\/ultrasuonindt.it\/chi-siamo\/\">More information about RODER SRL : about us<\/a><br\/>Contact for general information : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><br\/>Contact for information about these products : <a href=\"mailto:info@roder.it\">info@roder.it<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\"><br\/>The information contained on this web page is provided for information purposes only. Although it has been compiled with the utmost care, it does not constitute a contractual offer or a binding commitment to supply. It may contain transcription, translation or typographical errors. For precise and up-to-date information, please contact our company directly.    <\/p>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">Some images on this website have been intentionally generated using Artificial Intelligence (AI). This is because, for many applications and projects, it is not possible to disclose photographs of the installation or of the actual system due to confidentiality agreements, confidentiality clauses and non-disclosure agreements (NDAs). <\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>In steel structures the preloading of bolts is not an assembly detail: it is an execution requirement, and the standard states by which methods it can be achieved. EN 1090-2 is the execution standard for steel structures. The full title of part 2 is \u201cExecution of steel structures and aluminium structures \u2014 Part 2: Technical [&hellip;]<\/p>\n","protected":false},"author":157040980,"featured_media":2759,"parent":4654,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Section 8 of EN 1090-2:2018 and bolted connections: which preloading methods are permitted in the execution of load-bearing steel structures.","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"footnotes":""},"class_list":["post-3366","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the 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puede obtener. \u2713 EN 1090-2:2018 (+A1:2024), requisitos t\u00e9cnicos para estructuras de acero \u2713 La secci\u00f3n 8 trata las uniones atornilladas \u2713\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Dakota NDT CX aplicaci\u00f3n de medici\u00f3n de espesor por ultrasonidos sobre piezas de calderer\u00eda","src":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, 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structurels","author":"GSM","date":"7 September 2026","format":false,"excerpt":"Dans les structures en acier, la pr\u00e9contrainte des boulons n'est pas un d\u00e9tail de montage : c'est une exigence d'ex\u00e9cution, et la norme indique par quelles m\u00e9thodes on peut l'obtenir. \u2713 EN 1090-2:2018 (+A1:2024), exigences techniques pour les structures en acier \u2713 La section 8 traite des assemblages boulonn\u00e9s \u2713\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Dakota NDT CX application de mesure d'\u00e9paisseur par ultrasons sur pi\u00e8ces de charpente 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